Buying a used car can be a smart move — lower upfront costs, slower depreciation, and more choice than ever. But with so many options on the market, it’s easy to slip up and end up with a car that doesn’t quite fit the bill. Whether you're upgrading your runaround or hunting for a first car, here are five common used car buying mistakes — and how to avoid them.
1. Skipping the Research
The mistake: Jumping into a purchase without doing your homework.
Too often, buyers rush into deals based on looks or price alone. But without checking the car’s background, running costs, and how it stacks up against similar models, you're driving blind.
What to do instead:
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Compare models for fuel economy, insurance group, and known issues.
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Read reviews from real drivers and experts. We have a great guide on the best used cars of 2025 to help.
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Check the market value using trusted tools.
✅ Top tip: Use our online search filters to compare makes, models, specs and prices in seconds — so you’re always one step ahead.
2. Not Setting a Budget (Including Running Costs)
The mistake: Only budgeting for the purchase price.
It’s easy to fixate on the sticker price, but the real cost of car ownership includes insurance, tax, fuel, maintenance and potential repairs.
What to do instead:
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Factor in running costs before you commit.
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Decide whether to pay outright or finance it.
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If you're considering car finance, understand the difference between HP and PCP — each suits different needs and budgets.
💡 Need help budgeting? Our car finance experts can guide you through options to suit your lifestyle.
3. Forgetting to Check the Car’s History
The mistake: Not reviewing the vehicle’s past.
A good-looking car can still hide a dodgy past — from write-offs to unpaid finance or inconsistent service history.
What to do instead:
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Always get a full vehicle history check.
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Ask for service records, MOT history and previous ownership details.
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Buy from a trusted dealer such as who offers full transparency.
🔍 Every car listed with CarGiant includes a full history check and multi-point inspection for peace of mind.
4. Skipping the Test Drive
The mistake: Buying without driving.
Even if everything looks perfect on paper, the feel of the car matters. Does it suit your driving style? Are there any odd noises or warning lights?
What to do instead:
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Always take the car for a test drive.
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Try a mix of roads — urban, motorway, and residential.
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Pay attention to how it accelerates, brakes and handles.
🚗 At CarGiant, you can book a test drive at your convenience — no pressure, no obligation.
5. Not Considering Part-Exchange
The mistake: Leaving your old car out of the deal.
You could be sitting on extra value. Many buyers forget to factor in their existing vehicle, missing out on a lower price or better finance terms.
What to do instead:
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Get a quick, free part-exchange valuation online.
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Use it to reduce your upfront cost or monthly payments.
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Don’t be afraid to negotiate — your old car is worth something.
♻️ We make part-exchange easy. Get an instant valuation and use it toward your next car — simple.
Ready to Buy Smarter?
Avoiding these five mistakes can save you time, stress and money — and help you drive off in a car that truly fits your life.